import javax.swing.*;
import java.io.*;
import java.util.Scanner;

public class Demo19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要搜索的路径: ");
        String rootPath = scanner.next();
        File rootFile= new File(rootPath);
        if(!rootFile.isDirectory()){
            System.out.println("要搜索的路径有误");
            return;
        }
        System.out.println("请输入要搜索的查询词: ");
        String key= scanner.next();

        //进行递归
        scan(rootFile,key);
    }

    private static void scan(File rootFile, String key) {
        if(!rootFile.isDirectory()){
            return;
        }
        File[] files= rootFile.listFiles();
        if(files == null || files.length ==0){
            return;
        }
        for(File f: files){
            if(f.isFile()){
                //进行后续查询操作
                doSearch(f,key);
            }else{
                //进行递归
                scan(f,key);
            }
        }
    }
    private static void doSearch(File f, String key){
        //打开文件,读取文件内容,判定文件内容是否包含key
        StringBuilder stringBuilder=new StringBuilder();

        try(Reader reader=new FileReader(f)){
            char[] buffer =new char[1024];
            while(true){
                int n= reader.read(buffer);
                if(n==-1){
                    break;
                }
                String s = new String(buffer,0,n);
                stringBuilder.append(s);
            }
        }catch(IOException e){
            e.printStackTrace();
        }
        if(stringBuilder.indexOf(key) == -1){
            return;//未找到
        }
        System.out.println("找到匹配的文件" + f.getAbsolutePath());
    }
}
